terraform/command/graph.go

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package command
import (
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"bytes"
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"flag"
"fmt"
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"os"
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"strings"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/digraph"
"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/cli"
)
// GraphCommand is a Command implementation that takes a Terraform
// configuration and outputs the dependency tree in graphical form.
type GraphCommand struct {
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ContextOpts *terraform.ContextOpts
Ui cli.Ui
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}
func (c *GraphCommand) Run(args []string) int {
cmdFlags := flag.NewFlagSet("graph", flag.ContinueOnError)
cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
return 1
}
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var path string
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args = cmdFlags.Args()
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if len(args) > 1 {
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c.Ui.Error("The graph command expects one argument.\n")
cmdFlags.Usage()
return 1
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} else if len(args) == 1 {
path = args[0]
} else {
var err error
path, err = os.Getwd()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error getting pwd: %s", err))
}
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}
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conf, err := config.LoadDir(path)
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if err != nil {
c.Ui.Error(fmt.Sprintf("Error loading config: %s", err))
return 1
}
g, err := terraform.Graph(&terraform.GraphOpts{
Config: conf,
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Providers: c.ContextOpts.Providers,
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})
if err != nil {
c.Ui.Error(fmt.Sprintf("Error creating graph: %s", err))
return 1
}
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buf := new(bytes.Buffer)
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nodes := make([]digraph.Node, len(g.Nouns))
for i, n := range g.Nouns {
nodes[i] = n
}
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digraph.GenerateDot(nodes, buf)
c.Ui.Output(buf.String())
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return 0
}
func (c *GraphCommand) Help() string {
helpText := `
Usage: terraform graph [options] PATH
Outputs the visual graph of Terraform resources. If the path given is
the path to a configuration, the dependency graph of the resources are
shown. If the path is a plan file, then the dependency graph of the
plan itself is shown.
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The graph is outputted in DOT format. The typical program that can
read this format is GraphViz, but many web services are also available
to read this format.
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`
return strings.TrimSpace(helpText)
}
func (c *GraphCommand) Synopsis() string {
return "Output visual graph of Terraform resources"
}